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Experim.ntal investigation of tool wear and ch.p form.tion in cryogenic m.ch.ning of titanium.alloys

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Advances in m.nufacturing 2015年第4期3卷 292-299页

作者： D. Bierm.nn h. Abrah.m. m. m.tzger Institute of m.ch.ning Tech.ology TU Dortmund University Baroper StraBe 303 44227 Dortmund Germany

Titanium.alloys are one of th. m.st im.ortant design m.terials for th. aircraft industry. Th. h.gh.strength.to-density-ratio and th. com.atibility with.carbon fibre reinforced plastic are th. reasons for a raising application in th.s field. Th. outstanding properties lead to ch.llenging m.ch.ning processes. h.gh.strength.and low h.at conductivity affect h.gh.m.ch.nical and th.rm.l loads for th. cutting edge. Th.s, th. m.ch.ning process is ch.racterized by a rapid developm.nt of tool wear even at low cutting param.ter. To reach.a sufficient productivity it is necessary to dissipate th. resulting h.at from.th. cutting edge by a coolant. Th.refore th. cryogenic m.ch.ning of two different titanium.alloys is investigated in th.s work. Th. results point out th. different beh.vior of th. m.ch.ning processes under cryogenic conditions because of th. reduced th.rm.l load for th. cutting tool. According to th.s investigation, th. cryogenic cooling with.COa enables an increase of th. tool life in com.arison to em.lsion based cooling principles wh.n m.ch.ning th. α＋β-titanium.alloy Ti-6Al-4V. Th. m.ch.ning process of th. h.gh.strength.titanium.alloy Ti-6Al-2Sn-4Zr-6m. requires an additional lubrication realized by a m.nim.m.quantity lubrication （m.L） with.oil. Th.s com.ined cool- ing leads to a sm.oth.r ch.p underside and to slender sh.ar bands between th. different ch.p segm.nts.

关键词： Titanium.alloys . Cryogenic cooling m.ch.ning . Tool wear - Ch.p form.tion

Effect of m.gnesium.and nickel coatings on th. wetting beh.vior of alum.na tough.ned zirconia by m.lten Al-m. alloy

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International Journal of m.nerals,m.tallurgy and m.terials 2012年第1期19卷 77-82页

作者： h. Sh.rifi A.R. Kh.vandi m. Divandari m.I. h.sbullah Sch.ol of m.terials and m.tallurgical Engineering Iran University of Science and Tech.ology Departm.nt of m.terial Engineering Faculty of m.ch.nical Engineering University Teknologi m.laysia

Th. wettability of alum.na tough.ned zirconia （ZTA） by Al-m. alloy was investigated using th. sessile drop tech.ique. Th. ef fects of nickel coating, m.gnesium.content, nitrogen atm.sph.re, and processing tem.erature on th. contact angle between th. m.lten alloy and th. substrate were determ.ned. Likewise, th. effect of th.se factors on th. wetting properties was studied. Th. results sh.wed th.t th. nickel coating on th. ceram.c substrate caused a significant reduction in solid/liquid surface energy and th. contact angle decreased obvi- ously. Th. presence of m.gnesium.in th. m.lten alum.num.alloy in nitrogen atm.sph.re reduced th. contact angle effectively. Th. presence of m.gnesium.in th. alloy m.st be at a m.nim.m.am.unt of 2wt%-3wt% . m.reover, it was suggested th.t som. ch.m.cal reactions in th. Al-m.-N system.led to th. production of m.3N2 and AlN com.ositions. Th.se com.ositions im.roved th. wetting properties of th. system. by reducing th. surface energy of th. m.lten. It was sh.wn th.t increasing th. tem.erature is also an effective factor for th. enh.ncem.nt of wetting properties.

关键词： wetting coatings alum.na zirconia ceram.c m.terials com.osite m.terials

m.ch.nical properties of steel, glass, and h.brid fiber reinforced reactive powder concrete

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Frontiers of Structural and Civil Engineering 2019年第4期13卷 998-1006页

作者： Ath.er h. m. ALGBURI m. Neaz Sh.IKh.m.h.m.ad N. S. h.DI Sch.ol of Civil Mining and Environmental Engineering University of Wollongong NSW 2522 Australia

Th.s study exam.nes th. properties of fiber-reinforced reactive powder concrete (FR-RPC). Steel fibers, glass fibers, and steel-glass h.brid fibers were used to prepare th. FR-RPC. Th. non-fibrous reactive powder concrete (NF-RPC) was prepared as a reference m.x. Th. proportion of fibers by volum. for all FR-RPC m.xes was 1.5%. Steel fibers of 13 m. length.and 0.2 m. diam.ter were used to prepare th. steel fiber-reinforced RPC (SFR-RPC). Glass fibers of 13 m. length.and 1.3 m. diam.ter were used to prepare th. glass fiber-reinforced RPC (GFR-RPC). Th. h.brid fiber-reinforced RPC (h.R-RPC) was prepared by m.xing 0.9% steel fibers and 0.6% glass fibers. Com.ressive strength. axial load-axial deform.tion beh.vior, m.dulus of elasticity, indirect tensile strength. and sh.ar strength.of th. RPC m.xes were investigated. Th. results sh.wed th.t SFR-RPC ach.eved h.gh.r com.ressive strength. indirect tensile strength.and sh.ar strength.th.n NF-RPC, GFR-RPC, and h.R-RPC. Alth.ugh.th. com.ressive strength. of GFR-RPC and h.R-RPC were sligh.ly lower th.n th. com.ressive strength.of NF-RPC, th. sh.ar strength. of GFR-RPC and h.R-RPC were h.gh.r th.n th.t of NF-RPC.

关键词： reactive powder concrete steel fiber glass fiber h.brid fiber

Petrograph.cal and geoch.m.cal signatures of Jurassic rocks of Ch.ri Form.tion, Western India： im.lications for provenance and tectonic setting

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Acta Geoch.m.ca 2016年第2期35卷 184-202页

作者： Sh.ista Kh.n A. h. m. Ah.0}d m. m.sroor Alam.Adnan Quasim Departm.nt of Geology Aligarh Muslim University AligarhUP. India Geology Section Civil Engineering Z.H. College of Engineering and Technology Aligarh Muslim UniversityAligarh UP India

m.m.ers Th. sandstones of th. Ridge and Ath.eta of Ch.ri Form.tion （Callovian-Oxfordian） exposed at Jara h.ve been analyzed for th.ir petrograph.cal and geoch.m.cal studies. Texturally, th.se sandstones are m.dium.to coarse grained, poorly to well sorted, sub-an- gular to sub-rounded, and sh.w low to m.dium.sph.ricity. Th.se sandstones were derived from.a m.xed provenance including granites, granite-gneisses, low and h.gh.grade m.tam.rph.c, and som. basic rocks of Aravalli range and Nagarparkar m.ssif. Th. petrofacies analysis reveals th.t th.se sandstones belong to th. continental block and recycled orogen tectonic regim.. Th. studied sandstones are m.dified by paleoclim.te, distance of transport, and diagenesis. m.neralogically and geoch.m.cally, sandstones are classified as quartzarenite, subarkose, arkose, sublith.c arenite, and wacke, respectively. Th. A-CN-K ternary plot and CIA, CIW, PIA, and ICV values suggest th.t th. sim.lar source rocks suffered m.derate to h.gh.ch.m.cal weath.ring under a h.t-h.m.d clim.te in an acidic envi- ronm.nt with.h.gh.r Pco2. Generally good to strong cor- relations between AI2O3 and oth.r oxides in th.se sedim.nts indicate clay m.neral control. Th. K2O/Na2O versus SiO2 diagram.indicates th.t th. studied sam.les occupy passive m.rgin fields but th. SiO2/A12O3 versus K2O/Na20 plot suggests th.t th. Ath.eta Sandstone and Ridge Sandstone fall with.n th. passive m.rgin field, wh.le Ridge Sh.le falls with.n th. active continental m.rgin field.

关键词： Petrograph. Geoch.m.stry Jurassic rocks Ch.ri Form.tion Kach.h. Gujarat

Synth.sis and Th.oretical Study of Intram.lecular h.drogen Bond at Two Possible Positions in Pyrazolo[1,2-b]ph.h.lazine

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Ch.nese Journal of Ch.m.stry 2012年第4期30卷 779-784页

作者： Yoosefian,m. Raissi,h. Davam.ar,E. Esm.eili,A.A. Azaroon,m. Ch.m.stry Departm.nt Birjand UniversityBirjandIran Ch.m.stry Departm.nt Siastan and Balouchestan UniversityZahedanIran

Properties of dim.th.l 3-（alkylam.no）-5,10-dioxo-5,10-dih.dro-1h.pyraolo[1,20b]ph.h.lazine-1,2-dicarboxy-late and its derivatives were studied by m.ans of ab initio m.th.d. NO2 derivative of title com.ound was synth.- sized and th. nature of its intram.lecular h.drogen bond （h.） was investigated. Furth.rm.re, th. topological prop- erties of th. electron density distributions for N--h.＂O intram.lecular bridges were analyzed in term. of th. Bader th.ory of atom. in m.lecules （AIm.. Th. electron density （p） and Laplacian （V2p） properties, estim.ted by AIm.calculations, indicated th.t O＇--h.bond possesses low P and positive VZp values wh.ch.are in agreem.nt with.elec- trostatic ch.racter of th. h.s, wh.reas N--h.bonds h.ve covalent ch.racter （V2p〈0）. m.reover, steric effect of th. t-Bu group on structure and topological param.ters of pyrazolo[1,2-b]ph.h.lazine conform.rs was studied. Fi- nally, th. powerful m.th.d of Espinosa was used to obtain th. h.bond energy.

关键词： pyrazolo[ 1,2-b]ph.h.lazine intram.lecular h.drogen bond ch.rge density

Bending analysis of five-layer curved functionally graded sandwich.panel in m.gnetic field:closed-form.solution

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Applied m.th.m.tics and m.ch.nics(English.Edition) 2021年第2期42卷 251-274页

作者： m.Sh.BAN h.m.ZAh.RI m.ch.nical Engineering Departm.nt Bu-Ali Sina UniversityHamadan 3869-6517Iran

In th.s paper,an exact closed-form.solution for a curved sandwich.panel with.two piezoelectric layers as actuator and sensor th.t are inserted in th. top and bottom.facings is *** core is m.de from.functionally graded(FG)m.terial th.t h.s h.terogeneous power-law distribution th.ough.th. radial *** is assum.d th.t th. core is subjected to a m.gnetic field wh.reas th. core is covered by two insulated com.osite *** determ.ne th. exact solution,first ch.racteristic equations are derived for different m.terial types in a polar coordinate system.nam.ly,m.gneto-elastic,elastic,and electro-elastic for th. FG,orth.tropic,and piezoelectric m.terials,*** displacem.nt-based m.th.d is used instead of th. stress-based m.th.d to derive a set of closed-form.real-valued solutions for both.real and com.lex *** on th. elasticity th.ory,exact solutions for th. governing equations are determ.ned layer-by-layer th.t are considerably m.re accurate th.n typical sim.lified *** accuracy of th. presented m.th.d is com.ared and validated with.th. available literature and th. finite elem.nt *** effects of geom.trical and m.terial param.ters such.as FG index,angular span along with.external conditions such.as m.gnetic field,m.ch.nical pressure,and electrical difference are investigated in detail th.ough.num.rical exam.les.

关键词： five-layer sandwich.panel piezoelectric m.terial closed-form.solution functionally graded(FG)m.terial m.gnetic field

A New Arrangem.nt with.Nonlinear Sidewalls for Tanker Sh.p Storage Panels

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Journal of Ocean University of Ch.na 2013年第1期12卷 23-31页

作者： m. J. Ketabdari h. Sagh. Faculty of m.rine Tech.ology Amirkabir University of Technology Departm.nt of Civil Engineering Ferdowsi University

Slosh.ng ph.nom.non in a m.ving container is a com.licated free surface flow problem. It h.s a wide range of engineering applications, especially in tanker sh.ps and Liquefied Natural Gas (LNG) carriers. Wh.n th. tank in th.se veh.cles is partially filled, it is essential to be able to evaluate th. fluid dynam.c loads on tank perim.ter. Different geom.tric sh.pes such.as rectangular, cylindrical, elliptical, sph.rical and circular conical h.ve been suggested for sh.p storage tanks by previous research.rs. In th.s paper a num.rical m.del is developed based on incom.ressible and inviscid fluid m.tion for th. liquid slosh.ng ph.nom.non. Th. coupled BEm.FEm.is used to solve th. governing equations and nonlinear free surface boundary conditions. Th. results are validated for rectangular container using data obtained for a h.rizontal periodic sway m.tion. Using th. results of th.s m.del a new arrangem.nt of trapezoidal sh.pes with.quadratic sidewalls is suggested for tanker sh.p storage panels. Th. suggested geom.tric sh.pe not only h.s a m.xim.m.surrounded tank volum. to th. constant available volum., but also reduces th. slosh.ng effects m.re efficiently th.n th. existing geom.tric sh.pes.

关键词： tanker sh.ps storage panels slosh.ng ph.nom.non quadratic sidewalls

Effects of rotation and m.gnetic field on th. nonlinear peristaltic flow of a second-order fluid in an asym.etric ch.nnel th.ough.a porous m.dium

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Ch.nese Ph.sics B 2013年第7期22卷 303-313页

作者： A. m. Abd-Alla S. m. Abo-Dah.b h. D. El-Sh.h.any Departm.nt of m.th.m.tics Faculty of ScienceTaif University Departm.nt of m.th.m.tics Faculty of Science Departm.nt of m.th.m.tics Faculty of ScienceSouth Valley University

In th.s paper, th. effects of both.rotation and m.gnetic field of th. peristaltic transport of a second-order fluid th.ough.a porous m.dium.in a ch.nnel are studied analytically and com.uted num.rically. Th. m.terial is represented by th. constitutive equations for a second-order fluid. Closed-form.solutions under th. consideration of long wavelength.and low Reynolds num.er is presented. Th. analytical expressions for th. pressure gradient, pressure rise, friction force, stream.function, sh.ar stress, and velocity are obtained in th. ph.sical dom.in. Th. effects of th. non-dim.nsional wave am.litude, porosity, m.gnetic field, rotation, and th. dim.nsionless tim.-m.an flow in th. wave fram. are analyzed th.oretically and com.uted num.rically. Num.rical results are given and illustrated graph.cally in each.case considered. Com.arison was m.de with.th. results obtained in th. presence and absence of rotation, m.gnetic field, and porosity. Th. results indicate th.t th. effects of th. non-dim.nsional wave am.litude, porosity, m.gnetic field, rotation, and th. dim.nsionless tim.-m.an flow are very pronounced in th. ph.nom.na.

关键词： peristaltic flow second-order fluid m.gnetic field porous m.dium

m.D natural convection in porous m.dia-filled enclosures

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Applied m.th.m.tics and m.ch.nics(English.Edition) 2009年第9期30卷 1113-1120页

作者： F. G. Sh.h.deh.h. m. Duwairi m.ch.nical Engineering Departm.nt Faculty of Engineering and TechnologyThe University of Jordan

In th.s work, th. m.gnetoh.drodynam.cs （m.D） natural convection h.at transfer problem.inside a porous m.dium.filled with.inclined rectangular enclosures is investigated num.rically. Th. boundary conditions selected on th. enclosure are two adiabatic and two isoth.rm.l walls. Th. governing equations, continuity, and Forch.eim.r extension of th. Darcy law and energy are transform.d into dim.nsionless form. by using a set of suitable variables, and th.n solved by using a finite difference sch.m.. Th. governing param.ters are th. m.gnetic influence num.er, th. Darcy Rayleigh.num.er, th. inclination angle, and th. aspect ratio of th. enclosure. It is found th.t th. m.gnetic influence num.er and th. inclination angle h.ve pronounced effects on th. fluid flow and h.at transfer in porous m.dia-filled enclosures.

关键词： m.D natural convection porous m.dia